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Matthew, the +1 tube extension is here : https://www.thecountryshed.com/02-04-10.html
there are no forends that I know of that will work mag ext here thecountryshed.com/02-04-10.html
Save the money for training! Why do you NEED the extension and the modified fore end? Have you done any tactical drills with your shotgun to see if you need these or only want them? Pull the plug in your shotgun magazine tube, load it up with 2 3/4 inch 00 buckshot and you will have enough firepower for any situation inside your home. Cosmetics are wasted on a functional tool. As far as the fore end, try out verticals/slant and even the strap type...I think you will find that the factory shape is the most ergonomic. Even the military shotguns have a standard slide. (I carried a Remington 870 for 21 years in the military).